If you could design your ideal baby, what would you choose? A lover of naps who sleeps through the night? A mind for math and an affinity for the viola? For the founders of fertility tech startup Herasight, this is not a hypothetical.

Herasight founder Michael Christensen is 6-foot-6, and even in a world where taller men are perceived as stronger and more competent, it’s a bit much. He wants his future children to be shorter and more comfortable on commercial planes.

“It’s annoying to be super tall,” he said. “Nothing is made for you.”

Chief science officer Tobias Wolfram has already banked frozen embryos with his partner in preparation for their future family. His great-grandparents lived past 100 with no cancer or serious health problems, suggesting a family tendency toward healthy ag

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